However, severely impacted by intensive human activities, species resources in Yangtze River have been on constant decline, and the situation of migration species is among the worst.

由于人类活动的影响，长江大批物种资源持续衰退，而洄游性物种的衰退尤为严重。

youdao

Without more research, we can't predict if Assisted Migration will work for any given species.

没有更多的研究，我们无法预测辅助迁移是否适用于某一特定的物种。

youdao

Assisted migration means picking up members of a species, or members of a group of interdependent species and physically moving or translocating them.

辅助迁移指的是挑选一个物种的成员，或一组相互依赖的物种的成员，并在物理上移动或迁移它们。

youdao

But fisheries experts say plans by Cambodia,Laos and Thailand to build hydropower dams on the Mekong would block fish migration, threatening already endangered species.

VOA: standard.2010.01.11

We saw and heard about the impacts, from slumping land due to the melting of permafrost to hunter stories about the northward migration of species and the challenge that early ice break up poses for transportation.

CNN: Sailing the Northwest Passage: mission accomplished

It includes information on behaviour, habitat, reproduction and migration patterns, the introduction of new and invasive species.

UNESCO: Indigenous Peoples

Conocimientos del pueblo Mayangna sobre la convivencia del hombre y la naturaleza: peces y tortugas, demonstrates the depth and breadth of local knowledge of the natural milieu, including behaviour, habitat, reproduction and migration patterns, and the introduction of new and invasive species.

UNESCO: Social and Human Sciences